Looks like wood tannin.
mistergreen · Registered Joined Mar 3, 2007 · 3,458 Posts #5 · 3 mo ago View full thread Looks like wood tannin.
mistergreen · Registered Joined Mar 3, 2007 · 3,458 Posts #8 · 3 mo ago View full thread Embrace it. It’s part of putting wood in your tank. A water change will help temporarily.
